Recent prefix assignments

5 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 435

UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 4

TDS BROADBAND SERVICE LLC 1

New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
—	435-723	not yet reported which blocks →	QWEST CORPORATION	9636	BRIGHAM CY	UT
—	435-724	5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ROOSEVELT	UT
—	435-725	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	ROOSEVELT	UT
—	435-727	not yet reported which blocks →	NAVAJO COMM CO INC - UT DBA NAVAJO COMM UT	4451	MONUMNTVLY	UT
—	435-729	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PARK CITY	UT
—	435-730	5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BRIGHAM CY	UT
—	435-731	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	PARK CITY	UT
—	435-733	3XXX7XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DUCHESNE	UT
—	435-734	not yet reported which blocks →	QWEST CORPORATION	9636	BRIGHAM CY	UT
—	435-735	not yet reported which blocks →	SOUTH CENTRAL UTAH TEL. ASSN., INC.	2286	HATCH	UT
—	435-738	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	DUCHESNE	UT
—	435-739	not yet reported which blocks →	NAVAJO COMM CO INC - UT DBA NAVAJO COMM UT	4451	HALCHITA	UT
—	435-740	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	BRIGHAM CY	UT
—	435-743	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	FILLMORE	UT
—	435-744	3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	QWEST CORPORATION	9636	BRIGHAM CY	UT
—	435-747	not yet reported which blocks →	BEEHIVE TELEPHONE COMPANY, INC. (UTAH)	4611	GROUSE CRK	UT
—	435-748	not yet reported which blocks →	EMERY TELEPHONE DBA EMERY TELCOM	2278	CASTLEDALE	UT
—	435-749	3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	CASTLEDALE	UT
—	435-750	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-752	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-753	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-754	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-755	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-757	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LOGAN	UT
—	435-758	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	SCIPIO	UT
—	435-759	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	KANOSH	UT
—	435-760	6XXX8XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	LOGAN	UT
—	435-764	not yet reported which blocks →	T-MOBILE USA, INC.	6529	LOGAN	UT
—	435-770	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	LOGAN	UT
—	435-771	0XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	MONROE	UT
—	435-772	1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	QWEST CORPORATION	9636	ST GEORGE	UT
—	435-773	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7176	ST GEORGE	UT
—	435-774	0XXX2XXX3XXX5XXX6XXX7XXX · 2 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7176	LOGAN	UT
—	435-775	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7176	TOOELE	UT
—	435-776	0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 6 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7176	PARK CITY	UT
—	435-781	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	VERNAL	UT
—	435-782	not yet reported which blocks →	ALL WEST COMMUNICATIONS - UT	2288	JORDANELLE	UT
—	435-783	not yet reported which blocks →	ALL WEST COMMUNICATIONS - UT	2288	KAMAS	UT
—	435-784	not yet reported which blocks →	UNION TEL. CO.	2297	MANILA	UT
—	435-786	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-787	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-788	not yet reported which blocks →	BEEHIVE TELEPHONE COMPANY, INC. (UTAH)	4611	TICABOO	UT
—	435-789	not yet reported which blocks →	UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS	2287	VERNAL	UT
—	435-790	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VERNAL	UT
—	435-792	not yet reported which blocks →	QWEST CORPORATION	9636	LOGAN	UT
—	435-793	not yet reported which blocks →	ALL WEST COMMUNICATIONS - UT	2288	RANDOLPH	UT
—	435-795	not yet reported which blocks →	CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT	4429	HOLDEN	UT
—	435-797	not yet reported which blocks →	ONVOY, LLC - UT	871E	LOGAN	UT
—	435-799	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	LOGAN	UT
—	435-801	not yet reported which blocks →				UT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.